Charge of uniform surface density (0.20 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2.0 m
a. 17 N/C
b. 11 N/C
c. 23 N/C
d. 28 N/C
e. 40 N/C
b
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Orbital Angular Momentum: An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. What is the magnitude of the orbital angular momentum of the atom?
A. 1.0 
B. 1.2 
C. 1.4 
D. 1.7 
E. 2.0 
The equation has been proposed by Hausen for the transition range (2300 < Re < 8000) as well as for higher Reynolds numbers. Compare the values of Nu predicated by Hausen’s equation for Re = 3000 and Re = 20,000 at D/L = 0.1 and 0.01 with those obtained from Gnielinski correlation. Assume the fluid is water at 15°C flowing through a pipe at 100°C.
GIVEN
• Water flowing through a pipe
• The Hausen correlation given above
• Water temperature = 15°C
• Pipe temperature = 100°C
FIND
• The Nusselt number using the Hausen correlation and appropriate equations and charts in the text for Re = 3000 and 20,000 and D/L = 0.1 and 0.01
ASSUMPTIONS
• Steady state
• Constant and uniform pipe temperature
SKETCH
PROPERTIES AND CONSTANTS
for water at 15°C
Absolute viscosity (?b) = 1136 × 10–6 (Ns)/m2
Prandtl number (Pr) = 8.1 At 100°C ?s = 277.5 × 10–6 (Ns)/m2
Prs= 1.75
Why are collisions between galaxies more likely than collisions of stars within galaxies?
A) Relative to their sizes, galaxies are much closer together than stars. B) Galaxies are much larger than stars. C) Galaxies travel through space much faster than stars. D) Galaxies have higher redshifts than stars.
Compared to the density of water, our Earth averages about:
A) the same density, similar to Saturn. B) 3 times denser, much like our Moon. C) 4 times denser, similar to Mars. D) 5 times denser, like the Mercury and Venus. E) 10 times denser, due to our core of iron and nickel.